Apparatus, system and method for installing an LED-based track lighting system

ABSTRACT

A system, method, and apparatus for retrofitting a fluorescent light fixture accommodating an LED-based lighting system. A track is electrically connected to the driver module. The track includes at least one electronic conductor that is connected along the length of the track. At least one track adapter may connect to the track, and the track adapter includes a locking mechanism that allows the track adapter to connect to the track at any location along the track and the track may be removed. The locking mechanism may permit the track adapter to be removable. At least one light engine module can connect to the track and may also be removable.

CROSS-REFERENCE TO RELATED APPLICATIONS

This patent application is a Continuation and claims benefit andpriority to U.S. patent application Ser. No. 16/207,674, titled“APPARATUS SYSTEM AND METHOD FOR RETROFITTING A FLUORESCENT LIGHTFIXTURE TO AN LED-BASED LIGHTING SYSTEM”, filed on Dec. 13, 2018, whichclaims priority to U.S. patent application Ser. No. 15/680,437, titled“APPARATUS SYSTEM AND METHOD FOR RETROFITTING A FLUORESCENT LIGHTFIXTURE TO AN LED-BASED LIGHTING SYSTEM,” filed on Aug. 18, 2017, bothof which are herein incorporated by reference in its entirety

FIELD

The present disclosure generally relates to LED lighting fixtures and,more particularly, is related to retrofitting a fluorescent lamp fixtureto accommodate an LED-based lighting system.

BACKGROUND

In the electric lighting industry, fluorescent lighting fixtures havebeen commonly used fixtures in various residential, commercial, andindustrial buildings. However, these lighting fixtures generally haverelatively poor electrical efficiency and provide a relatively poorlight quality. Recently, light emitting diode (LED) based lightingsystems have been popular choices in place of fluorescent lightingfixtures, as LED fixtures generally are more energy efficient, lastlonger, and provide high-quality light.

Replacing fluorescent lighting fixtures for LED-based lighting fixturesmay be an extremely laborious and expensive endeavor. There generallymay be limited options to change the light output or the lightdistribution without undue labor and expense in removing the oldfluorescent based lighting fixture and adding a new LED lightingfixture. A better option for retrofitting a fluorescent light fixture toaccommodate a LED based lighting system without undue expense and labortherefore is needed.

Thus, a heretofore unaddressed need exists in the industry to addressthe aforementioned deficiencies and inadequacies.

SUMMARY

In light of the foregoing, the present disclosure generally relates to asystem, method, and apparatus for retrofitting a fluorescent lightfixture to an LED-based lighting system. Generally, regarding thestructure of the system, the system may include a driver module. A trackmay be electrically connected to the driver module, and the track mayinclude at least one electronic conductor that may be disposed along alength of the track. At least one track adapter may be configured toconnect to the track, and the track adapter may include a lockingmechanism that allows the track adapter to removably connect to thetrack at any location along the track. At least one light engine modulemay removably connect to the track.

Generally, the method for retrofitting a lighting fixture to accommodatean LED-based lighting apparatus contains the step of: mounting a trackto the lighting fixture. The track may include a first electricalconductor and a second electrical conductor located along the track. Themethod may include installing a driver module that may be in electricalcommunication with the first electrical conductor and the secondelectrical conductor. The method may include connecting a track adapterto the track. The track adapter may be in electrical communication withthe first electrical conductor and the second electrical conductor ofthe track. The method may include connecting a light engine module tothe track adapter. The method may include locking the track adapter tothe track using a locking mechanism. The locking mechanism may be usedto engage the track adapter and light engine to the track at a desiredposition along the track and then may be used to disengage the trackadapter to remove the track adapter and light engine.

Generally, regarding the structure of the apparatus for retrofitting alighting fixture to an LED-based lighting device, the apparatus mayinclude a track that has a first electric conductor and a secondelectric conductor located along a length of the track. The track may beconfigured to be located within a troffer of the lighting fixture. Theapparatus may include a light engine module. A track adapter may beconnected to the track using a locking mechanism that can be unlocked sothat the track adapter can later be removed or relocated. The trackadapter may connect to the light engine module.

Other systems, methods, features, and advantages of the presentdisclosure will be or become apparent to one with skill in the art uponexamination of the following drawings and detailed description. It isintended that all such additional systems, methods, features, andadvantages be included within this description, be within the scope ofthe present disclosure, and be protected by the accompanying claims.

BRIEF DESCRIPTION OF THE DRAWINGS

The present disclosure can be better understood with reference to thefollowing drawings. The components of the drawing are not necessarily toscale, emphasis instead being placed upon clearly illustrating theprinciples of the present disclosure. Moreover, in the drawings, likereferenced numbers designate corresponding parts throughout the severalviews.

FIG. 1 is a perspective view of an LED-based lighting apparatus, inaccordance with a first exemplary embodiment of the present disclosure.

FIG. 2A is a cross-sectional view of the track for the LED-basedlighting apparatus illustrated in FIG. 1, in accordance with a firstexemplary embodiment of the present disclosure.

FIG. 2B is a cross-sectional view of a second track design for theLED-based lighting apparatus illustrated in FIG. 1, in accordance with afirst exemplary embodiment of the present disclosure.

FIG. 2C is a cross-sectional view of a third track design for theLED-based lighting apparatus illustrated in FIG. 1, in accordance with afirst exemplary embodiment of the present disclosure.

FIG. 3A is a perspective view of the track adapter for the LED-basedlighting apparatus illustrated in FIG. 1, in accordance with the firstexemplary embodiment of the present disclosure.

FIG. 3B is a front elevation view of the track adapter illustrated inFIG. 3A in an unlocked position, in accordance with the first exemplaryembodiment of the present disclosure.

FIG. 3C is a right side view of the track adapter illustrated in FIG.3A-B in an unlocked position, in accordance with the first exemplaryembodiment of the present disclosure.

FIG. 3D is a right side view of the track adapter illustrated in FIG.3A-C in a locked position, in accordance with the first exemplaryembodiment of the present disclosure.

FIG. 4A is a right side view of the track adapter as illustrated in FIG.3A-D in an unlocked position and positioned to engage the trackillustrated in FIG. 2A, in accordance with the first exemplaryembodiment of the present disclosure.

FIG. 4B is a right side view of the track adapter as illustrated in FIG.3A-D in a locked position and engaged with the track illustrated in FIG.2A, in accordance with the first exemplary embodiment of the presentdisclosure.

FIG. 5 is an exploded perspective view of the light engine module asillustrated in FIG. 1, in accordance with the first exemplary embodimentof the present disclosure.

FIG. 6 is a flowchart illustrating a method for retrofitting a lightingfixture to accommodate an LED-based lighting apparatus, in accordancewith the first exemplary embodiment of the present disclosure.

DETAILED DESCRIPTION

The present disclosure generally relates to LED lighting fixtures and,more particularly, is related to retrofitting fluorescent lightingfixtures to accommodate a LED-based lighting system. It should be notedthat, while the following provides a series of examples of the LEDlighting system and its components, other configurations may be utilizedwithout departing from the scope of the claims.

FIG. 1 is a perspective view of an LED-based lighting apparatus 10, inaccordance with a first exemplary embodiment of the present disclosure.The lighting apparatus 10 includes a track 20. The track 20 may includea mechanical fastener 12 for attaching the track 20 within a portion ofa lighting fixture such as a troffer 14. Mechanical fasteners 12 caninclude screws, bolts, or another fastener known in the art.

As illustrated in FIG. 1, a driver module 30 is connected electricallyto the track 20. The driver module 30 may include or be housed in ajunction box. The driver module 30 may provide electricity to the track20. The driver module 30 may be integral to or located in closeproximity to the track 20, but may also be located remotely and mayprovide power to the system 10 via a cable 32 or a system of cables orwires. The driver module 30 may be configured to deliver direct current(DC) to the track 20.

The driver module 30 may include a transformer and other electricalcircuitry to transform an alternating current power source into alow-voltage direct current using known methods. The transformer may beotherwise be located in electrical communication anywhere between thedriver module 30 and the light engine module 40. An external powersource (not shown) may be used to deliver electrical power to the drivermodule 30 using an external conductive cable (not shown). The drivermodule 30 may include a lighting control 38 such as a switch to controlwhether the driver module 30 provides power to the system 10. Thelighting control 38 may be manual. The lighting control 38 may be wiredor wirelessly connected to a network, using communications protocolssuch as Wi-Fi, Bluetooth, Ethernet, or any other known communicationsprotocol.

The driver module 30 may include other controls such as controls forsafety, circuit breakers, voltage regulators, surge protectors, oranother control known in the art. The lighting control 38 may be locatedwithin the driver module 30. The lighting control may be locatedremotely from the driver module 30 and be electrically connected to thedriver module 30 using a cable or a system of cables. The driver module30 may include a dimmer module that may comprise a dimming method suchas phase cut dimming or 0-10 volt dimming. The dimmer module may belocated within the driver module 30. The dimmer module may be locatedremotely from the driver module 30 and may be electrically connected tothe driver module 30 using a cable or a system of cables.

The light engine module 40 may be connected to the track 20 at a desiredposition along the track 20 using a track adapter 50. The light enginemodule 40 may be electrically connected and mechanically connected tothe track adapter 50. The track adapter 50 may mechanically andelectrically engage to the light engine module 40 using lockingmechanisms, pre-formed slots, or outward biasing to removably engage thelight engine module 40 to the track adapter 50.

As illustrated in FIG. 1, multiple track adapters 50 (e.g., three trackadapters 50 shown in FIG. 1) may be engaged to the track 20. The presentdisclosure contemplates using any number of track adapters 50 on thetrack 20 to achieve optimal lighting intensity and coverage for anylighting system. The lighting system 10 may accommodate retrofitting awide variety of traditionally fluorescent-based lighting fixtures,including, but not limited to, 2 foot by 2 foot (2×2) and 2 foot by 4foot (2×4) fixtures that include one lamp or multiple lamps within thelight fixture troffers. One or more light engines of just under 2 feetor 4 feet may be utilized within the light fixture troffers.

The scalable design feature of the present disclosure may allow for oneor more track adapters 50 to connect to the track 20 and place one ormore light engine modules 40 in desired positions to accommodate avariety of lighting fixtures to provide optimal lighting quality andlight distribution. The scalability of the track adapters 50 may allowfor a user to retrofit a wide variety of fluorescent-based lightingfixtures to accommodate an LED-based lighting system without requiring aspecific LED-based lighting system 10 for each specific lighting fixtureconventional in the art. Rather, the user may use the track 20, lightengine module 40, and track adapter 50 described herein, and mayconfigure the components as desired to supply high quality light andoptimal light distribution to the wide variety of fluorescent basedlighting fixtures known in the art. The user may place track adapters 50and light engine modules 40 to the track 20 as needed to provide optimallight distribution given the specific needs of the lighting fixture.

As illustrated in FIG. 1, the LED-based lighting system 10 of thepresent disclosure may be mounted to a lighting component such as atroffer (not shown). Mounting the lighting system 10 into a troffer usedin a previous fluorescent based lighting fixture may be advantageous toa user because the system 10 does not require the complete destructionof the previous lighting fixture and reconstruction of a new LED-basedlighting fixture. The user can save time and resources by keeping thecentral components of the previous lighting system, such as the troffer(not shown), when installing the new LED-based lighting system 10.

FIG. 2A is cross-sectional view of a first track design for theLED-based lighting apparatus 10 as illustrated in FIG. 1, in accordancewith a first exemplary embodiment of the present disclosure. The track20 may comprise a substantially elongated body. The track 20 may includeat least one electrical conductor that may be used to conductelectricity. In FIG. 2, three electrical conductors 22L, 22N, 22G areillustrated. In this arrangement, the three conductors include a liveconductor 22L, a neutral conductor 22N, and a ground conductor 22G. Thetrack 20 may have one or more insulating members 25 in which to mountthe conductors 22L, 22N, 22G and insulate other components of orexterior to the track 20 from the current conducted along the electricalconductors 22L, 22N, 22G. The electrical conductors 22L, 22N, 22G may bepositioned along a desired length of the track 20 or may be positionedalong the entire length of the track 20 and the electrical conductors22L, 22N, 22G may be of different lengths. The electrical conductors22L, 22N, 22G are positioned to deliver current to the track adapter 50(illustrated in FIG. 1) as is explained and illustrated further herein.

As illustrated in FIG. 2, the track 20 may generally form a channel 24.The channel 24 may allow the track adapter 50 (illustrated in FIG. 1),when unlocked, to easily move or slide along the track 20 to bepositioned for optimal light distribution. The track 20 may havemechanical engaging members 26 that allow for the track adapter 50 toengage and lock to the track 20 mechanically. While only one possiblemechanical engagement technique is illustrated, any comparablemechanical engagement technique is contemplated and intended to becovered by the scope of the claims.

FIG. 2B is a cross-sectional view of a second track design for theLED-based lighting apparatus illustrated in FIG. 1, in accordance with afirst exemplary embodiment of the present disclosure. The track 120illustrated in FIG. 2B is similar to the track 20 in FIG. 2A. The track120 includes the conductors 22L, 22N, the channel 24, the one or moreinsulating members 25 and the mechanical engaging members 26.

A difference between the first track design and second track design isthat the second track design does not contain a ground (22G asillustrated in FIG. 2A). The first track design may also be adoptedwithout a ground. Without a ground running some or all of the length ofthe track 120, an exterior frame 27 of the track 120 may be used as theelectrical ground.

FIG. 2C is a cross-sectional view of a third track design for theLED-based lighting apparatus illustrated in FIG. 1, in accordance with afirst exemplary embodiment of the present disclosure. The track 220illustrated in FIG. 2C is similar to the track 20 in FIG. 2A and thetrack 120 in FIG. 2B. The track 220 includes the conductors 22L, 22N,the channel 24, the one or more insulating members 25 and the mechanicalengaging members 26. As in the second track design, the exterior frame27 may be used as the electrical ground. As can be seen comparing FIG.2B and FIG. 2C, the one or more insulating members could be a monolithicstructure or could be a plurality of structures. Other track 220profiles are contemplated and within the scope of the presentapplication.

FIG. 3A is a perspective view of the track adapter 50 for the LED-basedlighting apparatus illustrated in FIG. 1, in accordance with a firstexemplary embodiment of the present disclosure. The track adapter 50includes at least one engagement mount 52, which includes at least oneelectrical conductor configured to engage the track 20 electrically anda mechanical element to engage the track 20 mechanically. Two engagementmounts 52A, 52B are illustrated in FIG. 3A. Each engagement mount 52A,52B includes a resilient member 56 and at least one electrical conductor57, 59. The electrical conductors 57, 59 may extend from the engagementmounts 52A, 52B, with an electrical path therethrough and through atrack adapter body 58 to deliver current to a light engine 40 (shown inFIG. 1).

The track adapter 50 may include at least one locking mechanism 54extending from the track adapter body 58. The locking mechanism 54 maybe configured to lock the track adapter 50 in place along a desiredposition of the track 20. The locking mechanism 54 may rotate engagementmounts 52A, 52B that frictionally lock at least one resilient member 56to the track 20. The at least one resilient member 56 may provide africtional and/or pressure fit with the mechanical engaging members 26of the track 20 (shown in FIG. 2A-C). The locking mechanism 54 mayutilize a latch or an outwardly biasing system for securing theresilient member 56.

FIG. 3B is a front elevation view of the track adapter illustrated inFIG. 3A in an unlocked position, in accordance with the first exemplaryembodiment of the present disclosure. It is observed that the trackadapter 50 may have a locking mechanism 54 on both the left and rightside of the track adapter body 58, wherein one locking mechanismcontrols a first engagement mount 52A and another locking mechanismcontrols a second engagement mount 52B. It is also contemplated that thetrack adapter 50 will have one locking mechanism that controls bothengagement mounts 52 in concert. From this angle, the electricalconductors 57, 59 are more easily observed. The first engagement mount52A has one conductor 59, which is mounted at a different elevation thanthe conductors 57 on the second engagement mount 52B. The firstengagement mount 52A may electrically engage a grounded track conductor22G, while the second engagement mount 52B may electrically engage alive track conductor 22L and a neutral track conductor 22N. For tracks120, 220 that lack a grounded conductor 22G, the first engagement mount52A may be constructed without any electrical conductor 59 or the trackadapter 50 may be constructed with only one engagement mount 52B.

FIG. 3C is a right side view of the track adapter illustrated in FIG.3A-B in an unlocked position, in accordance with the first exemplaryembodiment of the present disclosure. The first engagement mount 52A andits conductor 59 are not shown in this angle because they are obstructedby the second engagement mount 52B.

FIG. 3D is a right side view of the track adapter illustrated in FIG.3A-C in a locked position, in accordance with the first exemplaryembodiment of the present disclosure. The first engagement mount 52A isnot shown in this angle because it is obstructed by the secondengagement mount 52B, but the conductor 59 is visible. Comparing FIG. 3Cand FIG. 3D, it is clear that the engagement mounts 52A, 52B have awider profile in the locked position as compared to the unlockedposition.

FIG. 4A is a right side view of the track adapter as illustrated in FIG.3A-D in an unlocked position and positioned to engage the trackillustrated in FIG. 2A, in accordance with the first exemplaryembodiment of the present disclosure. The engagement mounts 52A, 52B aresufficiently narrow in the unlocked position to slide up into an openingin the lower side of the track 20 and into the channel 24. The lockingmechanism 54 may be rotated from this position to cause the engagementmounts 52A, 52B to engage with the track 20.

FIG. 4B is a right side view of the track adapter as illustrated in FIG.3A-D in a locked position and engaged with the track illustrated in FIG.2A, in accordance with the first exemplary embodiment of the presentdisclosure. In the engaged position, the resilient members 56 areengaged with the mechanical engaging members 26 and the adapterconductors 57, 59 are engaged with the track conductors 22L, 22N, 22G.The one or more insulating members 25 protect the track exterior 27 fromthe current of the conductors 22L, 22N, 22G. The track body 58 supportsthe light engine 40 (not shown).

The locking mechanism 54 may be configured to removably engage theresilient member 56 with the track 20, as to allow the resilient members56 through manipulation of the locking mechanism 54 to disengage withthe mechanical engaging members 26, to re-position and re-lock the trackadapter 50 to any desired position along the track 20. The lockingmechanism 54 may include a latch, lever, or slot for a user to disengagethe resilient member 56 from the mechanical engaging members 26. Theresilient member 56 and the electrical conductors 57, 59 may bepositioned as desired to fit appropriately within the design of thetrack 20. The track adapter 50 may be designed to easily and removablyinstall onto a track 20, thereby saving time, resources, and expensewhen installing the LED light fixture 10.

The track adapter 50, as shown in FIG. 4A and FIG. 4B, may include a capthat may be placed over the engagement mounts 52A, 52B to protect theconductors 57, 59 from damage when in the disengaged position. The cap55 may be designed to fit into the channel 24 of the track 20 with atleast one slot to permit engagement of the electrical conductors 57, 59and the resilient members 56 when the engagement mounts 52A, 52B arerotated into the locked position.

FIG. 5 is an exploded perspective view of the light engine module 40.The light engine module 40 may include a circuit board 42 that maycontain a plurality of LED's 44. The circuit board 42 may comprise aknown printed circuit board (PCB) to provide electrical current to theplurality of LED's 44. The plurality of LED's 44 may be positioned inany given pattern or density on the circuit board 42 such that the lightengine module 40 provides an optimal light intensity, provided theapplication and desired light intensity. The light engine module 40 mayinclude track adapter engaging modules 48 configured mechanically andelectrically to engage to the track adapter 50. The track adapterengaging modules 48 may include a conventional mechanical engagingmethod such as a latch or slot to engage to the track adapter 50. Thetrack adapter engaging module 48 may include a conductive material toengage the light engine module 40 electrically to the track adapter 50.The light engine module 40 may include a cover 46 to protect theplurality of LED's 44 on the light engine module 40. The cover 46 may bemade of a plastic, glass, or another clear material to protect the LED's44 and adequately dissipate heat. The cover 46 may be permanentlymounted to the circuit board 42 or may include a latch or slot to removethe cover when desired. The light engine module 40 may be at least twofeet long and is generally no more than six inches wide, although theexact dimensions can differ depending on the application and desiredlight intensity and distribution.

The track adapter 50 may be integral with the light engine module 40 ormay be configured to engage mechanically and electrically to the lightengine module 40 or the track adapter engaging modules 48 in a mannerknown to those having ordinary skill in the art. In operation, a livecurrent may travel from the driver module 30, along a conductor in thecable 32, to a track conductor 22L, through an adapter conductor 57,through the light engine engaging module 48, to the light engine module40, back through the light engine module 48, through another adapterconductor 57, along another track conductor 22N, through anotherconductor in the cable 32, and back to the driver module 30.

FIG. 6 is a flowchart 300 illustrating a method for retrofitting alighting fixture to accommodate an LED-based lighting apparatus 10, inaccordance with the first exemplary embodiment of the presentdisclosure. It should be noted that any alternate implementations areincluded within the scope of the present disclosure in which functionsmay be executed out of order from that shown or discussed, includingsubstantially concurrently or in reverse order, depending on thefunctionality involved, as would be understood by those reasonablyskilled in the art of the present disclosure.

As shown in block 302, a track 20 is mounted within a lighting fixturetroffer, where the track 20 comprises at least one electrical conductor22L, 22N disposed along a length of the track 20. A driver module 30 isconfigured to be installed in electrical communication with theelectrical conductor 22L, 22N (block 304). A track adapter 50 is engagedto the track 20, where the track adapter 50 is configured to be inelectrical communication with the electrical conductor 22L, 22N of thetrack 20 (block 306). The track adapter 50 is connected to a lightengine module 40 (block 308). The track adapter 50 is locked to thetrack 20 using a locking mechanism 54, where the locking mechanism 54 isconfigured to removably engage the track adapter 50 to the track 20 at aposition along the track 20 (block 310).

It should be emphasized that the above described embodiments of thepresent disclosure are merely some possible examples of implementations,set forth for a clear understanding of the principles of the disclosure.Many variations and modifications may be made to the above describedembodiments of the disclosure without departing substantially from thespirit and principles of the disclosure. All such modifications andvariations are intended to be included herein within the scope of thisdisclosure and the present disclosure, and protected by the followingclaims.

What is claimed is:
 1. A track adaptor for an LED-based lighting systemcomprising: a track adaptor body; at least one engagement mount,comprising a resilient member, and at least one electrical conductor; atleast one locking mechanism within the body configured to engageremovably with a track; and a module connector capable of removablyengagement with a light engine module, wherein the locking mechanism isfixed to the at least one engagement mount such that a motion of thelocking mechanism is a corresponding motion of the at least oneengagement mount.
 2. The track adaptor of claim 1, wherein the track isin electrical communication with the light engine via the at least oneelectrical conductor.
 3. The track adaptor of claim 1, wherein thelocking mechanism protrudes from the track adaptor body.
 4. The trackadaptor of claim 3, wherein the resilient member is configured toremovably wedge within the track.
 5. The track adaptor of claim 1,wherein the locking mechanism is a latch, or outward biasing element. 6.The track adaptor of claim 1, wherein the locking mechanism whenunlocked allows the track adaptor to be slidably engaged within thetrack.
 7. The track adaptor of claim 1, wherein the track adaptor is inelectrical communication with a driver.
 8. A track adaptor for anLED-based lighting system comprising: a track adaptor body; at least oneengagement mount, comprising a resilient member, and at least oneelectrical conductor; at least one locking mechanism within the bodyconfigured to engage removably with a track; and a module connectorcapable of removably engagement with a light engine module, wherein theat least one engagement mount is a first engagement mount and a secondengagement mount.
 9. The track adaptor of claim 8, wherein the lockingmechanism is fixed to the at least one engagement mount such that amotion of the locking mechanism is a corresponding motion of the atleast one engagement mount.
 10. The track adaptor of claim 8, whereinthe first engagement mount includes one electrical conductor, and thesecond engagement mount includes two electrical conductors.
 11. Thetrack adaptor of claim 10, wherein the one electrical conductor of thefirst engagement mount is mounted at a different elevation than the twoelectrical conductors of the second engagement mount.
 12. The trackadaptor of claim 8, wherein the one electrical conductor of the firstengagement mount is in electrical communication with an electricalground of the track, and the two electrical conductors of the secondengagement mount are in electrical communication with a live conductorof the track, and a neutral conductor of the track.
 13. The trackadaptor of claim 8, wherein the locking mechanism includes a firstlocking mechanism to control the first engagement mount, and a secondlocking mechanism to control the second engagement mount.
 14. A tracksystem, comprising: a driver module; a track electrically connected tothe driver module, wherein the track comprises at least one electricalconductor disposed along a length of the track; and at least one trackadapter removably connected to the track, wherein the at least one trackadapter comprises a locking mechanism configured to engage removablywith the track at a position along the track, wherein the lockingmechanism when unlocked allows the track adaptor to be slidably engagedwithin the track.
 15. The system of claim 14, wherein the at least oneelectrical conductor further comprises two conductors and the twoelectrical conductors are positioned at different constant elevationsalong the length of the track.